CN114000537A - Single-side formwork erecting method suitable for ultra-high outer wall of deep foundation pit - Google Patents
Single-side formwork erecting method suitable for ultra-high outer wall of deep foundation pit Download PDFInfo
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- CN114000537A CN114000537A CN202111207352.0A CN202111207352A CN114000537A CN 114000537 A CN114000537 A CN 114000537A CN 202111207352 A CN202111207352 A CN 202111207352A CN 114000537 A CN114000537 A CN 114000537A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
- E02D31/025—Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
- E04G11/08—Forms, which are completely dismantled after setting of the concrete and re-built for next pouring
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/14—Bracing or strutting arrangements for formwalls; Devices for aligning forms
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0007—Production methods using a mold
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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Abstract
The invention provides a single-side formwork erecting method suitable for an ultrahigh outer wall of a deep foundation pit. The single-side formwork system can ensure good structural waterproof sealing performance of the concrete outer wall of the deep foundation pit; in the construction method, the form of the single-side support frame body is simple, and the size of the frame body can be always kept the same for wall surfaces with any height, so that the requirements on construction environment and construction space are low; the single-face formwork support body can be modularized and can be repeatedly utilized after construction is completed, so that the material and construction cost can be saved, and the measure expense of the single-face formwork support body can be reduced.
Description
Technical Field
The invention relates to a single-side formwork erecting method suitable for an ultrahigh outer wall of a deep foundation pit.
Background
In the construction of vertical bearing components such as cast-in-place concrete columns and walls, a counter-pull screw template supporting system which utilizes the self-balance of horizontal lateral force during concrete pouring is generally adopted, so that a counter-pull screw penetrating through the inside and the outside of the component needs to be arranged in the component. After the template is dismantled, the left split screw pore passage is difficult to be properly plugged, so that the sealing and waterproof performance of the vertical component is poor, and the method is particularly obvious on the outer wall of an underground building.
For building structures with high sealing quality requirements of basement exterior walls, some construction processes of single-side formwork support are adopted. The single-side formwork construction process directly bears horizontal lateral force during concrete pouring by arranging structures such as a frame body outside a concrete vertical member to be poured, and therefore a counter-pulling screw rod does not need to be arranged. After the construction is finished, the concrete vertical component has no bolt pore, and the waterproof sealing quality is good. However, the single-side formwork erecting process needs to set up an external frame, and the height of the external wall formwork is higher, the frame is larger, so that the single-side formwork erecting operation in the complex deep foundation pit is difficult, and the height of the single-side formwork erecting is generally only 6 to 7 meters at most.
Disclosure of Invention
The invention aims to provide a single-side formwork erecting method suitable for an ultrahigh outer wall of a deep foundation pit.
In order to solve the problems, the invention provides a single-side formwork erecting method suitable for an ultrahigh outer wall of a deep foundation pit, which comprises the following steps:
step S1, arranging embedded parts on the foundation pit concrete large bottom plate;
step S2, hoisting the vertical steel column at the first stage on the embedded part in the step S1, and connecting the vertical steel column with the upper part of the embedded part;
step S3, binding reinforcing steel bars of the first-stage deep foundation pit concrete outer wall at the side of the vertical steel column of the foundation pit fender post close to the first stage, arranging wall side embedded parts on the surfaces of the reinforcing steel bars of the first-stage deep foundation pit concrete outer wall close to the side of the vertical steel column of the first stage, and arranging water stop steel plates at construction joints at the tops of the reinforcing steel bars of the first-stage deep foundation pit concrete outer wall;
step S4, implanting upper steel bars into the deep foundation pit enclosing structure at the upper parts of the steel bars of the concrete outer wall of the deep foundation pit at the first stage;
step S5, connecting one end of an upper steel pull rod with the upper steel bar in the step S4, and connecting the other end of the upper steel pull rod with the upper part of the vertical steel column in the first stage in the step S2;
step S6, arranging a side die at the side of the vertical steel column, close to the first stage, of the deep foundation pit concrete outer wall at the first stage to be cast, arranging a batten secondary beam at the side of the side die, close to the vertical steel column at the first stage, and arranging a steel pipe main beam at the side of the batten secondary beam, close to the vertical steel column at the first stage;
step S7, one end of the jacking is jacked on the steel pipe main beam in the first stage in the step S6, and the other end of the jacking is jacked on the vertical steel column in the first stage in the step S2;
step S8, pouring and maintaining the concrete of the outer wall of the deep foundation pit at the first stage;
step S9, after the concrete of the outer wall of the deep foundation pit at the current stage poured in the step S8 is initially set, the jacking in the step S7 is removed, and the side die in the step S6 is removed to expose the wall side embedded part in the step S3;
step S10, connecting one end of the lower steel pull rod with the wall side embedded part arranged in the step S3, and connecting the other end of the lower steel pull rod with the vertical steel column of the previous stage;
step S11, removing an upper steel pull rod connected between the vertical steel column at the previous stage in the step S5 and an upper steel bar on the deep foundation pit support structure;
step S12, preparing to construct the external wall concrete of the deep foundation pit of the next stage, and connecting the upper part of the vertical steel column of the previous stage in the step S2 with the vertical steel column of the next stage;
step S13, binding reinforcing steel bars of the deep foundation pit concrete outer wall of the next stage at the side of the vertical steel column of the foundation pit fender post close to the next stage, arranging wall side embedded parts on the surfaces of the reinforcing steel bars of the deep foundation pit concrete outer wall of the next stage close to the side of the vertical steel column of the next stage, and arranging water stop steel plates at construction joints at the tops of the reinforcing steel bars of the deep foundation pit concrete outer wall of the next stage;
step S14, implanting upper steel bars into the deep foundation pit enclosing structure at the upper part of the steel bars of the concrete outer wall of the deep foundation pit at the next stage;
step S15, connecting one end of an upper steel tie bar with the upper steel bar in step S14, and connecting the other end of the upper steel tie bar with the upper portion of the vertical steel column of the next stage in step S12;
step S16, arranging a side die at the side of the vertical steel column, close to the next stage, of the deep foundation pit concrete outer wall at the next stage to be cast, arranging a batten secondary beam at the side of the side die, close to the vertical steel column at the next stage, and arranging a steel pipe main beam at the side of the batten secondary beam, close to the vertical steel column at the next stage;
step S17, one end of the jacking device is jacked on the steel pipe main beam at the next stage in the step S16, and the other end of the jacking device is jacked on the vertical steel column at the next stage in the step S12;
step S18, after the concrete of the outer wall of the deep foundation pit of the previous stage reaches a certain strength, pouring the concrete of the outer wall of the deep foundation pit of the next stage, and maintaining;
and repeating the steps S9 to S18 until the concrete outer wall of the deep foundation pit in all stages is finally finished.
Further, in the method, in step S1, the position of the embedded part is on the side of the concrete outer wall of the deep foundation pit to be cast, which is far away from the foundation pit fender pile.
Further, in the method, in step S1, the embedded parts are arranged before the concrete is poured after the reinforcement bars of the foundation pit concrete large bottom plate are bound.
Further, in the method, in step S1, the embedded part is 1m to 1.5m away from the outer side of the concrete outer wall of the deep foundation pit to be poured.
Further, in the above method, after step S2, the method further includes:
and a horizontal support rod piece is arranged between every two transversely adjacent vertical steel columns.
Further, in the above method, in step S4, the height of the upper reinforcing bars is higher than the top of the water stopping steel plate disposed in step S3.
Further, in the above method, after step S5, the method further includes:
and welding one end of the upper steel pull rod with the upper steel bar in the step S4.
Further, in the above method, after step S7, the method further includes:
and combining the jacking support and the floor steel pipe to form a force transmission support.
Further, in the above method, in step S14, the height of the upper reinforcing bars is higher than the top of the water stopping steel plate disposed in step S13.
Compared with the prior art, the invention has the beneficial effects that:
1) the single-side formwork system can ensure good structural waterproof sealing performance of the concrete outer wall of the deep foundation pit;
2) the construction method theoretically has no upper limit of construction height, and can be used for constructing the concrete outer wall of the deep foundation pit with any height;
3) in the construction method, the form of the single-side support frame body is simple, and the size of the frame body can be always kept the same for wall surfaces with any height, so that the requirements on construction environment and construction space are low;
4) the single-face formwork support body can be modularized and can be repeatedly utilized after construction is completed, so that the material and construction cost can be saved, and the measure expense of the single-face formwork support body can be reduced.
Drawings
Fig. 1 is a flowchart of a single-side formwork erecting method suitable for an ultra-high outer wall of a deep foundation pit according to an embodiment of the invention;
FIG. 2 is a schematic illustration of a first stage of construction according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a second stage of construction according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a third stage of construction according to an embodiment of the present invention;
1. embedding the parts; 2. a vertical steel column; 3. a water stop steel plate; 4. a wall side embedded part; 5. foundation pit fender posts; 6. an upper steel tie rod; 7. horizontally supporting; 8. a template system; 9. a jacking system; 10. the first stage is that the concrete outer wall of the deep foundation pit is formed; 11. a lower steel tie rod; 12. the second stage is the concrete outer wall of the deep foundation pit; 13. the third stage is a deep foundation pit concrete outer wall; 14. and an upper reinforcing steel bar.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 4, the invention provides a single-side formwork erecting method suitable for an ultrahigh outer wall of a deep foundation pit, which comprises the following steps:
as shown in fig. 2, step S1, arranging an embedded part 1 on the foundation pit concrete large bottom plate, where the embedded part 1 is located on a side of the deep foundation pit concrete outer wall to be poured, the side being far away from the foundation pit fender post;
preferably, the embedded parts 1 are arranged before concrete is poured after the reinforcing steel bars of the large foundation pit concrete bottom plate are bound, so that the workload increased by the rear embedded parts is reduced;
preferably, the distance between the embedded part and the outer side of the deep foundation pit concrete outer wall to be poured is 1m to 1.5m, so that a certain construction space is provided between the frame body and the deep foundation pit concrete outer wall to be constructed while reasonable stress of the frame body in the step S2 is ensured, and a working frame is erected;
as shown in fig. 2, in step S2, hoisting the vertical steel column 2 of the first stage on the embedded part 1 in step S1, and connecting the vertical steel column 2 with the upper part of the embedded part 1;
preferably, the strong axis side of the vertical steel column 2 in the first stage is directly opposite to the deep foundation pit concrete outer wall to be constructed;
preferably, the size of the vertical steel column 2 in the first stage is determined based on the structural system and load calculation;
preferably, when the vertical steel columns 2 in the first stage are long, a horizontal support rod 7 is arranged between every two adjacent horizontal vertical steel columns 2, or other lateral support measures are taken;
as shown in fig. 2, in step S3, binding reinforcing steel bars of the first-stage deep foundation pit concrete outer wall 10 on the side of the vertical steel column 2 of the first stage of the foundation pit fender post 5, arranging wall side embedded parts 4 on the surface of the reinforcing steel bars of the first-stage deep foundation pit concrete outer wall 10 on the side of the vertical steel column 2 of the first stage, and arranging water stop steel plates 3 at construction joints at the tops of the reinforcing steel bars of the first-stage deep foundation pit concrete outer wall 10;
preferably, the distance between the top of the wall side embedded part 4 arranged on the surface of the reinforcing steel bar of the deep foundation pit concrete outer wall 10 at a certain stage and the top of the reinforcing steel bar of the deep foundation pit concrete outer wall 10 at the stage is as small as possible under the condition of satisfying objective conditions;
as shown in fig. 2, in step S4, implanting an upper steel bar 14 on a deep foundation pit enclosure structure at the upper part of the steel bar of the first-stage deep foundation pit concrete outer wall 10, wherein the height of the upper steel bar 14 is higher than the top of the water-stop steel plate 3 arranged in step S3;
preferably, the embedded steel bars left when the outer waterproof coiled material lining wall is constructed can be directly used as the upper steel bars 14;
as shown in fig. 2, in step S5, one end of an upper steel tie 6 is connected to the upper steel bar 14 in step S4, and the other end of the upper steel tie is connected to the upper portion of the vertical steel column 2 of the first stage in step S2;
preferably, one end of the upper steel tie bar 6 is welded with the upper steel bar 14 in the step S4;
as shown in fig. 2, in step S6, a side form 8 is arranged on the side of the first-stage deep foundation pit concrete outer wall 10 to be cast, which is close to the vertical steel column 2 in the first stage, a batten secondary beam is arranged on the side of the side form 8, which is close to the vertical steel column 2 in the first stage, and a steel pipe main beam is arranged on the side of the batten secondary beam, which is close to the vertical steel column 2 in the first stage;
as shown in fig. 2, in step S7, one end of the top bracket 9 is abutted against the steel pipe main beam in the first stage in step S6, and the other end of the top bracket 9 is abutted against the vertical steel column 2 in the first stage in step S2;
preferably, the jacking support and the floor steel pipe are combined and connected to form a force transmission support, so that the lateral stability of the jacking support is ensured;
as shown in fig. 2, step S8, pouring and curing the first-stage deep foundation pit outer wall concrete 10;
as shown in fig. 2, in step S9, after the deep foundation pit outer wall concrete 10 at the current stage poured in step S8 is initially set, removing the top support in step S7 and the side mold 8 in step S6 to expose the wall side embedded part 4 in step S3, that is, after the deep foundation pit outer wall at the previous stage is initially set, removing the top support and the side mold 8 at the previous stage;
as shown in fig. 3 or 4, in step S10, one end of the lower steel tie rod 11 is connected to the wall side embedded part 4 arranged in step S3, and the other end of the lower steel tie rod 11 is connected to the vertical steel column 2 of the previous stage, for example, the vertical steel column 2 of the first stage in step S2;
as shown in fig. 3 or 4, in step S11, removing the upper steel tie 6 in step S5, that is, removing the upper steel tie 6 connected between the vertical steel column in the previous stage and the upper steel bar 14 on the deep foundation pit support structure;
as shown in fig. 3 or 4, step S12, then, preparation of the concrete for the exterior wall of the deep foundation pit of the next stage, such as the concrete 12 for the exterior wall of the deep foundation pit of the second stage, is started, and similarly to step S2, the upper portion of the vertical steel column 2 of the previous stage of step S2 is connected with the vertical steel column 2 of the next stage;
as shown in fig. 3 or 4, step S13, similar to step S3, binding reinforcing steel bars of the concrete outer wall of the deep foundation pit of the next stage on the side of the vertical steel column 2 of the foundation pit fender post 5 close to the next stage, arranging wall-side embedded parts 4 on the surface of the reinforcing steel bars of the concrete outer wall of the deep foundation pit of the next stage close to the side of the vertical steel column 2 of the next stage, arranging water-stop steel plates 3 at construction joints at the tops of the reinforcing steel bars of the concrete outer wall of the deep foundation pit of the next stage, for example, arranging the reinforcing steel bars of the second stage and arranging the water-stop steel plates and the wall-side embedded parts;
as shown in fig. 3 or 4, in step S14, similarly to step S4, upper reinforcing steel bars 14 are implanted into the deep foundation pit enclosure structure at the upper part of the reinforcing steel bars of the deep foundation pit concrete outer wall in the next stage, and the height of the upper reinforcing steel bars 14 is higher than the top of the water stop steel plate 3 arranged in step S13;
as shown in fig. 3 or 4, in step S15, similarly to step S5, one end of an upper steel tie 6 is connected to the upper steel bar 14 in step S14, and the other end of the upper steel tie 6 is connected to the upper portion of the vertical steel column 2 of the next stage in step S12;
as shown in fig. 3 or 4, in step S16, similarly to step S6, a side form 8 is arranged on the side of the deep foundation pit concrete outer wall 10 of the next stage to be cast, which is close to the vertical steel column 2 of the next stage, a wooden secondary beam is arranged on the side of the side form 8, which is close to the vertical steel column 2 of the next stage, and a steel pipe main beam is arranged on the side of the wooden secondary beam, which is close to the vertical steel column 2 of the next stage;
as shown in fig. 3 or 4, in step S17, similarly to step S7, one end of the top bracket 9 is abutted against the steel pipe main beam in the next stage in step S16, and the other end of the top bracket 9 is abutted against the vertical steel column 2 in the next stage in step S12;
as shown in fig. 3 or 4, in step S18, after the concrete of the outer wall of the deep foundation pit of the previous stage reaches a certain strength, for example, after the concrete 10 of the outer wall of the deep foundation pit of the first stage or the concrete 12 of the outer wall of the deep foundation pit of the second stage reaches a certain strength, the concrete of the outer wall of the deep foundation pit of the next stage, for example, the concrete 12 of the outer wall of the deep foundation pit of the second stage or the concrete 13 of the outer wall of the deep foundation pit of the third stage, that is, the concrete of the present stage, is poured and cured;
and repeating the steps S9 to S18 until the concrete outer wall of the deep foundation pit in all stages is finally finished.
Specifically, for the construction of the pit concrete outer wall at the last stage, because the building enclosure is not used for the planting bar, similar effects can be achieved by implanting upper reinforcing bars 14 or arranging embedded parts on other structures at the top of the building enclosure; preferably, the upper steel bars 14 can be implanted into the concrete bottom plate at the top of the enclosure structure, and the two ends of the upper steel pull rod 6 are respectively connected with the upper steel bars 14 and the vertical steel columns 2, so that the same force transmission effect is realized.
The construction method of the deep foundation pit concrete outer wall single-side formwork provided by the invention can effectively support the horizontal side pressure during concrete outer wall pouring, the formwork system has low requirements on construction environment, and the construction outer wall height is not limited.
The invention provides a single-side formwork erecting method suitable for an ultrahigh outer wall of a deep foundation pit, which is shown in a flow chart in figure 1, wherein a steel component material is Q345 in the embodiment, a foundation pit support structure is a cast-in-situ bored pile, the casting height of concrete at each stage is 3m, and the specific implementation method comprises the following steps:
as shown in fig. 2, firstly, when steel bars are bound on a concrete large bottom plate at the bottom of a foundation pit, a bottom plate embedded part is arranged, and then bottom plate concrete is poured; after the concrete of the bottom plate is initially set, hoisting a steel column, wherein the vertical steel column 2 is 18-th I-shaped steel in the example, the installation direction of the vertical steel column 2 is to enable a strong shaft of the section of the vertical steel column to bear main load, and the bottom of the vertical steel column is connected with the large bottom plate embedded part 1 through a bolt; when the vertical steel column 2 is hoisted, the reinforcing steel bars of the first-stage pit concrete outer wall 10 are bound, and a water stop steel plate 3 and a construction joint related structure shown in the figure 1 are arranged at the top of the reinforcing steel bars of the first-stage pit concrete outer wall 10, so that the waterproof and sealing performance of the construction joint is ensured; after the steel bars of the first-stage pit concrete outer wall 10 are bound, embedding a wall side embedded part 4 on the side surface of the steel bars of the first-stage pit concrete outer wall 10; in the embodiment, the embedded bars 14 on the foundation pit enclosure pile left when the concrete lining and the waterproof coiled material are constructed are directly utilized on the foundation pit enclosure pile, the upper steel pull rod 6 is hoisted, one end of a 14 b-shaped channel steel of the upper steel pull rod 6 is welded with the embedded bars 14, and the other end of the upper steel pull rod 6 is connected with the vertical steel column 2 through bolts; the maximum horizontal distance between the vertical steel columns 2 is determined by calculation, and in the embodiment, according to the section size of each component of the frame body, the concrete pouring height and the pouring condition, the maximum horizontal distance between the adjacent vertical steel columns 2 is within 900 mm; after the hoisting of the other adjacent vertical steel column 2 is finished, connecting the two vertical steel columns through a No. 5 angle steel, wherein the connecting node is connected through a bolt, so that an out-of-plane support is provided for the two vertical steel columns; then, a concrete wall side template system 8 is erected, the batten secondary beam of the template system is vertically placed, and the horizontal double-steel-pipe main beam is transversely placed; after the template system is erected, a template jacking system 9 is erected, the adjustable jacking is inserted into the short steel pipe, the short steel pipe is tightly jacked on the steel column, and the short steel pipe is fixed by using the transverse steel pipe and the vertical steel pipe; and after all the concrete is erected and the acceptance is qualified, the concrete outer wall of the first stage can be poured.
As shown in fig. 3, when the concrete strength of the outer wall 10 of the foundation pit in the first stage reaches 2.5MPa, loosening and removing the adjustable jacking, and then removing the template system; hoisting a lower pull rod 11, wherein the lower pull rod 11 is a 16-gauge I-steel, one end of the lower pull rod 11 is welded with the wall side embedded part 4 arranged at the previous stage, and the other end of the lower pull rod 11 is connected with the vertical steel column 2 through a bolt; then the upper steel pull rod 6 in the first stage is dismantled; hoisting the vertical steel column 6 in the second stage, wherein the vertical steel column 6 in the second stage is connected with the hoisted vertical steel column 6 in the first stage through bolts; when the vertical steel column 6 at the second stage is hoisted, the concrete outer wall steel bars at the second stage are bound, and a top water stop steel plate 3 and a construction joint structure are arranged; embedding a second-stage wall side embedded part 4 after the steel bars are bound; hoisting an upper steel pull rod 6 by using a steel bar planting 14 on the enclosure pile during construction of the lining wall and the waterproof coiled material, welding one end of the upper steel pull rod 6 with the steel bar planting 14, and connecting the other end of the upper steel pull rod 6 with the vertical steel column 2 in the second stage through a bolt; after the hoisting of one vertical steel column 2 is completed, connecting the two vertical steel columns 2 through a No. 5 angle steel; then, a concrete wall side template system 8 and a jacking system 9 are sequentially erected, and the erection method is the same as that in the previous stage; and after the concrete is completely erected and is qualified through acceptance and acceptance, and the strength of the concrete of the outer wall of the previous stage reaches 75%, the concrete outer wall of the previous stage can be poured.
As shown in fig. 4, the construction method is almost the same as that of the second stage in the third stage and thereafter; after the single-side formwork support formwork system used in the stage is fixed, the previous single-side formwork support steel frame 8 can be removed, in the embodiment, namely, when the third stage is constructed, the concrete wall side formwork system 8 in the first stage can be removed; the removed concrete wall side template system 8 can be repeatedly put into a subsequent construction stage to be utilized, so that the formwork support is modularized, and the consumption of single-side formwork support materials and the measure cost are reduced; in the construction of the last stage, one end of the upper steel pull rod 6 is connected with the vertical steel column 2, and the other end is connected with the embedded part arranged on the upper concrete bottom plate, so that the same force transmission effect is realized; after the concrete pouring in the last stage is finished, all the formwork systems can be gradually dismantled.
Due to the adoption of the scheme, the invention has the beneficial effects that:
1) the single-side formwork system can ensure good structural waterproof sealing performance of the concrete outer wall of the deep foundation pit;
2) the construction method theoretically has no upper limit of construction height, and can be used for constructing the concrete outer wall of the deep foundation pit with any height;
3) in the construction method, the form of the single-side support frame body is simple, and the size of the frame body can be always kept the same for wall surfaces with any height, so that the requirements on construction environment and construction space are low;
4) the single-face formwork support body can be modularized and can be repeatedly utilized after construction is completed, so that the material and construction cost can be saved, and the measure expense of the single-face formwork support body can be reduced.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A single-face formwork erecting method suitable for an ultrahigh outer wall of a deep foundation pit is characterized by comprising the following steps:
step S1, arranging embedded parts on the foundation pit concrete large bottom plate;
step S2, hoisting the vertical steel column at the first stage on the embedded part in the step S1, and connecting the vertical steel column with the upper part of the embedded part;
step S3, binding reinforcing steel bars of the first-stage deep foundation pit concrete outer wall at the side of the vertical steel column of the foundation pit fender post close to the first stage, arranging wall side embedded parts on the surfaces of the reinforcing steel bars of the first-stage deep foundation pit concrete outer wall close to the side of the vertical steel column of the first stage, and arranging water stop steel plates at construction joints at the tops of the reinforcing steel bars of the first-stage deep foundation pit concrete outer wall;
step S4, implanting upper steel bars into the deep foundation pit enclosing structure at the upper parts of the steel bars of the concrete outer wall of the deep foundation pit at the first stage;
step S5, connecting one end of an upper steel pull rod with the upper steel bar in the step S4, and connecting the other end of the upper steel pull rod with the upper part of the vertical steel column in the first stage in the step S2;
step S6, arranging a side die at the side of the vertical steel column, close to the first stage, of the deep foundation pit concrete outer wall at the first stage to be cast, arranging a batten secondary beam at the side of the side die, close to the vertical steel column at the first stage, and arranging a steel pipe main beam at the side of the batten secondary beam, close to the vertical steel column at the first stage;
step S7, one end of the jacking is jacked on the steel pipe main beam in the first stage in the step S6, and the other end of the jacking is jacked on the vertical steel column in the first stage in the step S2;
step S8, pouring and maintaining the concrete of the outer wall of the deep foundation pit at the first stage;
step S9, after the concrete of the outer wall of the deep foundation pit at the current stage poured in the step S8 is initially set, the jacking in the step S7 is removed, and the side die in the step S6 is removed to expose the wall side embedded part in the step S3;
step S10, connecting one end of the lower steel pull rod with the wall side embedded part arranged in the step S3, and connecting the other end of the lower steel pull rod with the vertical steel column of the previous stage;
step S11, removing an upper steel pull rod connected between the vertical steel column at the previous stage in the step S5 and an upper steel bar on the deep foundation pit support structure;
step S12, preparing to construct the external wall concrete of the deep foundation pit of the next stage, and connecting the upper part of the vertical steel column of the previous stage in the step S2 with the vertical steel column of the next stage;
step S13, binding reinforcing steel bars of the deep foundation pit concrete outer wall of the next stage at the side of the vertical steel column of the foundation pit fender post close to the next stage, arranging wall side embedded parts on the surfaces of the reinforcing steel bars of the deep foundation pit concrete outer wall of the next stage close to the side of the vertical steel column of the next stage, and arranging water stop steel plates at construction joints at the tops of the reinforcing steel bars of the deep foundation pit concrete outer wall of the next stage;
step S14, implanting upper steel bars into the deep foundation pit enclosing structure at the upper part of the steel bars of the concrete outer wall of the deep foundation pit at the next stage;
step S15, connecting one end of an upper steel tie bar with the upper steel bar in step S14, and connecting the other end of the upper steel tie bar with the upper portion of the vertical steel column of the next stage in step S12;
step S16, arranging a side die at the side of the vertical steel column, close to the next stage, of the deep foundation pit concrete outer wall at the next stage to be cast, arranging a batten secondary beam at the side of the side die, close to the vertical steel column at the next stage, and arranging a steel pipe main beam at the side of the batten secondary beam, close to the vertical steel column at the next stage;
step S17, one end of the jacking device is jacked on the steel pipe main beam at the next stage in the step S16, and the other end of the jacking device is jacked on the vertical steel column at the next stage in the step S12;
step S18, after the concrete of the outer wall of the deep foundation pit of the previous stage reaches a certain strength, pouring the concrete of the outer wall of the deep foundation pit of the next stage, and maintaining;
and repeating the steps S9 to S18 until the concrete outer wall of the deep foundation pit in all stages is finally finished.
2. The single-face formwork erecting method suitable for the ultrahigh outer wall of the deep foundation pit as claimed in claim 1, wherein in the step S1, the position of the embedded part is on the side of the concrete outer wall of the deep foundation pit to be cast, which is far away from the foundation pit fender pile.
3. The single-sided formwork erecting method applicable to the ultrahigh outer wall of the deep foundation pit as recited in claim 1, wherein in the step S1, the embedded parts are arranged before concrete is poured after the reinforcement of the concrete large bottom plate of the foundation pit is bound.
4. The single-sided formwork erecting method suitable for the ultra-high outer wall of the deep foundation pit as recited in claim 1, wherein in the step S1, the embedded part is 1m to 1.5m away from the outer side of the concrete outer wall of the deep foundation pit to be poured.
5. The single-sided formwork erecting method suitable for the ultra-high outer wall of the deep foundation pit as recited in claim 1, further comprising, after the step S2:
and a horizontal support rod piece is arranged between every two transversely adjacent vertical steel columns.
6. The single-sided formwork erecting method for the ultra-high outer wall of the deep foundation pit as recited in claim 1, wherein in the step S4, the height of the upper reinforcing steel bar is higher than the top of the water stop steel plate arranged in the step S3.
7. The single-sided formwork erecting method suitable for the ultra-high outer wall of the deep foundation pit as recited in claim 1, further comprising, after the step S5:
and welding one end of the upper steel pull rod with the upper steel bar in the step S4.
8. The single-sided formwork erecting method suitable for the ultra-high outer wall of the deep foundation pit as recited in claim 1, further comprising, after the step S7:
and combining the jacking support and the floor steel pipe to form a force transmission support.
9. The single-sided formwork erecting method for the ultra-high outer wall of the deep foundation pit as recited in claim 1, wherein in the step S14, the height of the upper reinforcing steel bar is higher than the top of the water stop steel plate arranged in the step S13.
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